Golang util.Recover函數代碼示例

// panicRecover wraps the panic recover process.
func panicRecover(handler func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		defer util.Recover()

		handler(w, r)
	}
}

// New initializes a user event queue with the specified wide session id.
func (ueqs queues) New(sid string) *UserEventQueue {

	if q, ok := ueqs[sid]; ok {
		logger.Warnf("Already exist a user queue in session [%s]", sid)

		return q
	}

	q := &UserEventQueue{
		Sid:   sid,
		Queue: make(chan *Event, maxQueueLength),
	}

	ueqs[sid] = q

	go func() { // start listening
		defer util.Recover()

		for evt := range q.Queue {
			logger.Debugf("Session [%s] received an event [%d]", sid, evt.Code)

			// process event by each handlers
			for _, handler := range q.Handlers {
				handler.Handle(evt)
			}
		}
	}()

	return q
}

//初始化配額配置
func InitQuotaAll() {
	defer util.Recover()

	rows, err := db.MySQL.Query(SELECT_QUOTA_ALL)
	if err != nil {
		logger.Errorf("load quota err [%s]", err)

		return
	}

	defer rows.Close()

	QuotaAll = nil
	QuotaAll = make(map[string]Quota)
	key := bytes.Buffer{}
	for rows.Next() {
		quota := Quota{}
		if err := rows.Scan(&quota.Id, &quota.CustomerId, &quota.TenantId, &quota.ApiName, &quota.Type, &quota.Value, &quota.Created, &quota.Created); err != nil {
			logger.Errorf("load quota err [%s]", err)
			break
		}
		key.WriteString(quota.CustomerId)
		key.WriteString(quota.TenantId)
		key.WriteString(quota.ApiName)
		key.WriteString(quota.Type)
		QuotaAll[key.String()] = quota
		key.Reset()
	}

	if err = rows.Err(); err != nil {
		logger.Errorf("load quota err [%s]", err)
	}

}

// FixedTimeSave saves online users' configurations periodically (1 minute).
//
// Main goal of this function is to save user session content, for restoring session content while user open Wide next time.
func FixedTimeSave() {
	go func() {
		defer util.Recover()

		for _ = range time.Tick(time.Minute) {
			users := getOnlineUsers()

			for _, u := range users {
				if u.Save() {
					logger.Tracef("Saved online user [%s]'s configurations", u.Name)
				}
			}
		}
	}()
}

// Load initializes the event handling.
func Load() {
	go func() {
		defer util.Recover()

		for event := range EventQueue {
			logger.Debugf("Received a global event [code=%d]", event.Code)

			// dispatch the event to each user event queue
			for _, userQueue := range UserEventQueues {
				event.Sid = userQueue.Sid

				userQueue.Queue <- event
			}
		}
	}()
}

// FixedTimeRelease releases invalid sessions.
//
// In some special cases (such as a browser uninterrupted refresh / refresh in the source code view) will occur
// some invalid sessions, the function checks and removes these invalid sessions periodically (1 hour).
//
// Invalid sessions: sessions that not used within 30 minutes, refers to WideSession.Updated field.
func FixedTimeRelease() {
	go func() {
		defer util.Recover()

		for _ = range time.Tick(time.Hour) {
			hour, _ := time.ParseDuration("-30m")
			threshold := time.Now().Add(hour)

			for _, s := range WideSessions {
				if s.Updated.Before(threshold) {
					logger.Debugf("Removes a invalid session [%s], user [%s]", s.ID, s.Username)

					WideSessions.Remove(s.ID)
				}
			}
		}
	}()
}

// FixedTimeReport reports the Wide sessions status periodically (10 minutes).
func FixedTimeReport() {
	go func() {
		defer util.Recover()

		for _ = range time.Tick(10 * time.Minute) {
			users := userReports{}
			processSum := 0

			for _, s := range WideSessions {
				processCnt := len(s.Processes)
				processSum += processCnt

				if report, exists := contains(users, s.Username); exists {
					if s.Updated.After(report.updated) {
						report.updated = s.Updated
					}

					report.sessionCnt++
					report.processCnt += processCnt
				} else {
					users = append(users, &userReport{username: s.Username, sessionCnt: 1, processCnt: processCnt, updated: s.Updated})
				}
			}

			var buf bytes.Buffer
			buf.WriteString("\n  [" + strconv.Itoa(len(users)) + "] users, [" + strconv.Itoa(processSum) + "] running processes and [" +
				strconv.Itoa(len(WideSessions)) + "] sessions currently\n")

			sort.Sort(users)

			for _, t := range users {
				buf.WriteString("    " + t.report() + "\n")
			}

			logger.Info(buf.String())
		}
	}()
}

func checkEnv() {
	defer util.Recover()

	cmd := exec.Command("go", "version")
	buf, err := cmd.CombinedOutput()
	if nil != err {
		logger.Error("Not found 'go' command, please make sure Go has been installed correctly")

		os.Exit(-1)
	}
	logger.Trace(string(buf))

	if "" == os.Getenv("GOPATH") {
		logger.Error("Not found $GOPATH, please configure it before running Wide")

		os.Exit(-1)
	}

	gocode := util.Go.GetExecutableInGOBIN("gocode")
	cmd = exec.Command(gocode)
	_, err = cmd.Output()
	if nil != err {
		event.EventQueue <- &event.Event{Code: event.EvtCodeGocodeNotFound}

		logger.Warnf("Not found gocode [%s], please install it with this command: go get github.com/nsf/gocode", gocode)
	}

	ideStub := util.Go.GetExecutableInGOBIN("ide_stub")
	cmd = exec.Command(ideStub, "version")
	_, err = cmd.Output()
	if nil != err {
		event.EventQueue <- &event.Event{Code: event.EvtCodeIDEStubNotFound}

		logger.Warnf("Not found ide_stub [%s], please install it with this command: go get github.com/88250/ide_stub", ideStub)
	}
}

// GoInstallHandler handles request of go install.
func GoInstallHandler(w http.ResponseWriter, r *http.Request) {
	result := util.NewResult()
	defer util.RetResult(w, r, result)

	httpSession, _ := session.HTTPSession.Get(r, "wide-session")
	if httpSession.IsNew {
		http.Error(w, "Forbidden", http.StatusForbidden)

		return
	}
	username := httpSession.Values["username"].(string)
	locale := conf.GetUser(username).Locale

	var args map[string]interface{}

	if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
		logger.Error(err)
		result.Succ = false

		return
	}

	sid := args["sid"].(string)

	filePath := args["file"].(string)
	curDir := filepath.Dir(filePath)

	cmd := exec.Command("go", "install")
	cmd.Dir = curDir

	setCmdEnv(cmd, username)

	logger.Debugf("go install %s", curDir)

	stdout, err := cmd.StdoutPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	stderr, err := cmd.StderrPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	if !result.Succ {
		return
	}

	channelRet := map[string]interface{}{}

	if nil != session.OutputWS[sid] {
		// display "START [go install]" in front-end browser

		channelRet["output"] = "<span class='start-install'>" + i18n.Get(locale, "start-install").(string) + "</span>\n"
		channelRet["cmd"] = "start-install"

		wsChannel := session.OutputWS[sid]

		err := wsChannel.WriteJSON(&channelRet)
		if nil != err {
			logger.Error(err)
			return
		}

		wsChannel.Refresh()
	}

	reader := bufio.NewReader(io.MultiReader(stdout, stderr))

	if err := cmd.Start(); nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	go func(runningId int) {
		defer util.Recover()
		defer cmd.Wait()

		logger.Debugf("User [%s, %s] is running [go install] [id=%d, dir=%s]", username, sid, runningId, curDir)

		// read all
		buf, _ := ioutil.ReadAll(reader)

		channelRet := map[string]interface{}{}
		channelRet["cmd"] = "go install"

		if 0 != len(buf) { // build error
			// build gutter lint

			errOut := string(buf)
			lines := strings.Split(errOut, "\n")
//.........這裏部分代碼省略.........

//.........這裏部分代碼省略.........
	if !result.Succ {
		return
	}

	channelRet := map[string]interface{}{}

	if nil != session.OutputWS[sid] {
		// display "START [go build]" in front-end browser

		channelRet["output"] = "<span class='start-build'>" + i18n.Get(locale, "start-build").(string) + "</span>\n"
		channelRet["cmd"] = "start-build"

		wsChannel := session.OutputWS[sid]

		err := wsChannel.WriteJSON(&channelRet)
		if nil != err {
			logger.Error(err)
			return
		}

		wsChannel.Refresh()
	}

	reader := bufio.NewReader(io.MultiReader(stdout, stderr))

	if err := cmd.Start(); nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	go func(runningId int) {
		defer util.Recover()
		defer cmd.Wait()

		// logger.Debugf("User [%s, %s] is building [id=%d, dir=%s]", username, sid, runningId, curDir)

		// read all
		buf, _ := ioutil.ReadAll(reader)

		channelRet := map[string]interface{}{}
		channelRet["cmd"] = "build"
		channelRet["executable"] = executable

		if 0 == len(buf) { // build success
			channelRet["nextCmd"] = args["nextCmd"]
			channelRet["output"] = "<span class='build-succ'>" + i18n.Get(locale, "build-succ").(string) + "</span>\n"

			go func() { // go install, for subsequent gocode lib-path
				defer util.Recover()

				cmd := exec.Command("go", "install")
				cmd.Dir = curDir

				setCmdEnv(cmd, username)

				out, _ := cmd.CombinedOutput()
				if len(out) > 0 {
					logger.Warn(string(out))
				}
			}()
		} else { // build error
			// build gutter lint

			errOut := string(buf)

// RunHandler handles request of executing a binary file.
func RunHandler(w http.ResponseWriter, r *http.Request) {
	result := util.NewResult()
	defer util.RetResult(w, r, result)

	var args map[string]interface{}

	if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
		logger.Error(err)
		result.Succ = false
	}

	sid := args["sid"].(string)
	wSession := session.WideSessions.Get(sid)
	if nil == wSession {
		result.Succ = false
	}

	filePath := args["executable"].(string)

	cmd := exec.Command(filePath)

	if conf.Docker {
		output.SetNamespace(cmd)
	}

	stdout, err := cmd.StdoutPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false
	}

	stderr, err := cmd.StderrPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false
	}

	outReader := bufio.NewReader(stdout)
	errReader := bufio.NewReader(stderr)

	if err := cmd.Start(); nil != err {
		logger.Error(err)
		result.Succ = false
	}

	wsChannel := session.PlaygroundWS[sid]

	channelRet := map[string]interface{}{}

	if !result.Succ {
		if nil != wsChannel {
			channelRet["cmd"] = "run-done"
			channelRet["output"] = ""

			err := wsChannel.WriteJSON(&channelRet)
			if nil != err {
				logger.Warn(err)
				return
			}

			wsChannel.Refresh()
		}

		return
	}

	channelRet["pid"] = cmd.Process.Pid

	// add the process to user's process set
	output.Processes.Add(wSession, cmd.Process)

	go func(runningId int) {
		defer util.Recover()
		defer cmd.Wait()

		logger.Debugf("User [%s, %s] is running [id=%d, file=%s]", wSession.Username, sid, runningId, filePath)

		// push once for front-end to get the 'run' state and pid
		if nil != wsChannel {
			channelRet["cmd"] = "run"
			channelRet["output"] = ""
			err := wsChannel.WriteJSON(&channelRet)
			if nil != err {
				logger.Warn(err)
				return
			}

			wsChannel.Refresh()
		}

		go func() {
			defer util.Recover()

			buf := outputBuf{}

			for {
				wsChannel := session.PlaygroundWS[sid]
				if nil == wsChannel {
					break
//.........這裏部分代碼省略.........

// New creates a wide session.
func (sessions *wSessions) New(httpSession *sessions.Session, sid string) *WideSession {
	mutex.Lock()
	defer mutex.Unlock()

	username := httpSession.Values["username"].(string)
	now := time.Now()

	ret := &WideSession{
		ID:          sid,
		Username:    username,
		HTTPSession: httpSession,
		EventQueue:  nil,
		State:       sessionStateActive,
		Content:     &conf.LatestSessionContent{},
		Created:     now,
		Updated:     now,
	}

	*sessions = append(*sessions, ret)

	if "playground" == username {
		return ret
	}

	// create user event queue
	ret.EventQueue = event.UserEventQueues.New(sid)

	// add a filesystem watcher to notify front-end after the files changed
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		logger.Error(err)

		return ret
	}

	go func() {
		defer util.Recover()

		workspaces := filepath.SplitList(conf.GetUserWorkspace(username))
		for _, workspace := range workspaces {
			filepath.Walk(filepath.Join(workspace, "src"), func(dirPath string, f os.FileInfo, err error) error {
				if ".git" == f.Name() { // XXX: discard other unconcered dirs
					return filepath.SkipDir
				}

				if f.IsDir() {
					if err = watcher.Add(dirPath); nil != err {
						logger.Error(err, dirPath)
					}

					logger.Tracef("Added a file watcher [%s]", dirPath)
				}

				return nil
			})

		}

		ret.FileWatcher = watcher
	}()

	go func() {
		defer util.Recover()

		for {
			ch := SessionWS[sid]
			if nil == ch {
				return // release this gorutine
			}

			select {
			case event := <-watcher.Events:
				path := event.Name
				dir := filepath.Dir(path)

				ch = SessionWS[sid]
				if nil == ch {
					return // release this gorutine
				}

				if event.Op&fsnotify.Create == fsnotify.Create {
					if err = watcher.Add(path); nil != err {
						logger.Warn(err, path)
					}

					logger.Tracef("Added a file watcher [%s]", path)

					cmd := map[string]interface{}{"path": path, "dir": dir, "cmd": "create-file"}
					ch.WriteJSON(&cmd)
				} else if event.Op&fsnotify.Remove == fsnotify.Remove {
					cmd := map[string]interface{}{"path": path, "dir": dir, "cmd": "remove-file"}
					ch.WriteJSON(&cmd)

				} else if event.Op&fsnotify.Rename == fsnotify.Rename {
					cmd := map[string]interface{}{"path": path, "dir": dir, "cmd": "rename-file"}
					ch.WriteJSON(&cmd)
				}
			case err := <-watcher.Errors:
				if nil != err {
//.........這裏部分代碼省略.........

// GoVetHandler handles request of go vet.
func GoVetHandler(w http.ResponseWriter, r *http.Request) {
	result := util.NewResult()
	defer util.RetResult(w, r, result)

	httpSession, _ := session.HTTPSession.Get(r, "wide-session")
	if httpSession.IsNew {
		http.Error(w, "Forbidden", http.StatusForbidden)

		return
	}
	username := httpSession.Values["username"].(string)
	locale := conf.GetUser(username).Locale

	var args map[string]interface{}

	if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
		logger.Error(err)
		result.Succ = false

		return
	}

	sid := args["sid"].(string)

	filePath := args["file"].(string)
	curDir := filepath.Dir(filePath)

	cmd := exec.Command("go", "vet", ".")
	cmd.Dir = curDir

	setCmdEnv(cmd, username)

	stdout, err := cmd.StdoutPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	stderr, err := cmd.StderrPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	if !result.Succ {
		return
	}

	channelRet := map[string]interface{}{}

	if nil != session.OutputWS[sid] {
		// display "START [go vet]" in front-end browser

		channelRet["output"] = "<span class='start-vet'>" + i18n.Get(locale, "start-vet").(string) + "</span>\n"
		channelRet["cmd"] = "start-vet"

		wsChannel := session.OutputWS[sid]

		err := wsChannel.WriteJSON(&channelRet)
		if nil != err {
			logger.Warn(err)
			return
		}

		wsChannel.Refresh()
	}

	reader := bufio.NewReader(io.MultiReader(stdout, stderr))

	if err := cmd.Start(); nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	go func(runningId int) {
		defer util.Recover()

		logger.Debugf("User [%s, %s] is running [go vet] [runningId=%d]", username, sid, runningId)

		channelRet := map[string]interface{}{}
		channelRet["cmd"] = "go vet"

		// read all
		buf, _ := ioutil.ReadAll(reader)

		// waiting for go vet finished
		cmd.Wait()

		if !cmd.ProcessState.Success() {
			logger.Debugf("User [%s, %s] 's running [go vet] [runningId=%d] has done (with error)", username, sid, runningId)

			channelRet["output"] = "<span class='vet-error'>" + i18n.Get(locale, "vet-error").(string) + "</span>\n" + string(buf)
		} else {
//.........這裏部分代碼省略.........

// Clone handles request of git clone.
func CloneHandler(w http.ResponseWriter, r *http.Request) {
	result := util.NewResult()
	defer util.RetResult(w, r, result)

	httpSession, _ := session.HTTPSession.Get(r, "wide-session")
	if httpSession.IsNew {
		http.Error(w, "Forbidden", http.StatusForbidden)

		return
	}
	username := httpSession.Values["username"].(string)
	locale := conf.GetUser(username).Locale

	var args map[string]interface{}
	if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
		logger.Error(err)
		result.Succ = false

		return
	}

	sid := args["sid"].(string)
	path := args["path"].(string)
	repository := args["repository"].(string)

	cmd := exec.Command("git", "clone", repository)
	cmd.Dir = path

	stdout, err := cmd.StdoutPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	stderr, err := cmd.StderrPipe()
	if nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	if !result.Succ {
		return
	}

	channelRet := map[string]interface{}{}

	if nil != session.OutputWS[sid] {
		// display "START [git clone]" in front-end browser

		channelRet["output"] = "<span class='start-get'>" + i18n.Get(locale, "start-git_clone").(string) + "</span>\n"
		channelRet["cmd"] = "start-git_clone"

		wsChannel := session.OutputWS[sid]

		err := wsChannel.WriteJSON(&channelRet)
		if nil != err {
			logger.Warn(err)
			return
		}

		wsChannel.Refresh()
	}

	reader := bufio.NewReader(io.MultiReader(stdout, stderr))

	if err := cmd.Start(); nil != err {
		logger.Error(err)
		result.Succ = false

		return
	}

	go func(runningId int) {
		defer util.Recover()
		defer cmd.Wait()

		logger.Debugf("User [%s, %s] is running [git clone] [runningId=%d]", username, sid, runningId)

		channelRet := map[string]interface{}{}
		channelRet["cmd"] = "git clone"

		// read all
		buf, err := ioutil.ReadAll(reader)
		if nil != err {
			logger.Warn(err)

			// TODO: handle clone error
		}

		logger.Debugf("User [%s, %s] 's running [git clone] [runningId=%d] has done: %s", username, sid, runningId, string(buf))

		channelRet["output"] = "<span class='get-succ'>" + i18n.Get(locale, "git_clone-done").(string) + "</span>\n"

		if nil != session.OutputWS[sid] {
			wsChannel := session.OutputWS[sid]
//.........這裏部分代碼省略.........